Howto close BHyVe console

Hi,
Just for a little question,
I could run BHyVe on my PC with neel's guest image by following CFT
page(http://callfortesting.org/bhyve/), it just worked without
problem, but I couldn't shutdown guest OS safely.
shutdown command in guest OS doesn't poweroff the VM, and I have no
idea to close bhyve console.
Is there any shortcut-key or commands to shutdown it?
I also tried vmmctl --vm=<vm name> --destroy, but it suddenly causes panic.
kill <bhyve pid> && vmmctl --vm=<vm name> --destroy had worked, so I
guess the panic reason is because /usr/sbin/bhyve still holding
/dev/vmm/<vm name>.
Takuya ASADA